Henri & Renaud Lifchitz's PRP Top records

What is a PRP ?

A PRP is a probable prime number, a number that nobody knows how to prove or disprove its primality.
Here are some criterions that can be used to recognize these numbers :

- N does not have any prime factor up to 2^32.
- N cannot be trivially written into a product.
- Take 3 square-free consecutive bases such that (b1/N)=(b2/N)=(b3/N)= -1. N should be such that b1^((N-1)/2)=b2^((N-1)/2)=b3^((N-1)/2)= -1 (mod N).
- Take a prime base such that (b/N)= -1 and b<>b1<>b2<>b3. N should pass the strong test in base b.
- or more (if someone has got an idea) !!!

Submit your PRPs

See the Top discoverers
See the Latest PRPs
Search by form


1-250	251-500	501-750	751-1000	1001-1250	1251-1500	1501-1750	1751-2000
2001-2250	2251-2500	2501-2750	2751-3000	3001-3250	3251-3500	3501-3750	3751-4000
4001-4250	4251-4500	4501-4750	4751-5000	5001-5250	5251-5500	5501-5750	5751-6000
6001-6250	6251-6500	6501-6750	6751-7000	7001-7250	7251-7500	7501-7750	7751-8000
8001-8250	8251-8500	8501-8750	8751-9000	9001-9250	9251-9500	9501-9750	9751-10000

Rank	Probable prime	Digits (> 50000)	Who ?	When ?
8001	NSW(139160)	106535	Robert Price	12/2018
8002	(7*10^106516+113)/3	106517	Robert Price	02/2018
8003	2^353832-1853849	106515	Enzo Doria	09/2015
8006	(7^126037-1)/6	106513	Paul Bourdelais	09/2008
8004	Phi(126037,7)	106513	Henri Lifchitz	12/2025
8005	Phi(252074,-7)	106513	Henri Lifchitz	02/2026
8007	2^353794-18453	106503	Enzo Doria	05/2013
8008	(2^353761+2094)/2	106493	Stefano Morozzi	09/2020
8009	2^353728+7695	106483	Lelio R Paula	01/2017
8010	26476^10509+10509^26476	106475	Hans Havermann	10/2020
8011	2^353672-303	106466	Yves Minet	02/2012
8012	6^136811+101	106460	Lelio R Paula	02/2017
8013	2^353641+1871981	106457	Enzo Doria	05/2016
8014	(8*10^106454-29)/3	106455	Robert Price	07/2018
8015	27845^6654+6654^27845	106454	Hans Havermann	11/2020
8016	10^106449-700001	106449	Robert Price	08/2021
8017	25316^16017+16017^25316	106444	Hans Havermann	11/2020
8018	2^353553+54615	106431	Lelio R Paula	01/2017
8019	2^353544-18897	106428	Enzo Doria	05/2013
8020	28894^4823+4823^28894	106426	Hans Havermann	11/2020
8021	(19*10^106422+29)/3	106423	Robert Price	12/2021
8022	(694*10^106418+53)/9	106420	Robert Price	02/2022
8023	6*10^106412-13	106413	Robert Price	07/2022
8024	25696^13829+13829^25696	106402	Hans Havermann	11/2020
8025	6^136729-133	106396	Lelio R Paula	02/2017
8026	2^353418+1605	106390	Lelio R Paula	01/2017
8027	2^353387+65	106381	Lelio R Paula	10/2011
8028	2^353372+74311	106376	Enzo Doria	04/2016
8029	2^353344-3693	106368	Yves Minet	03/2017
8030	(772*10^106365-7)/9	106367	Robert Price	06/2022
8031	(56*10^106351+619)/9	106352	Robert Price	05/2021
8033	2^353277-20089	106347	Enzo Doria	06/2013
8032	2^353275+72173	106347	Enzo Doria	04/2016
8034	2^353268-17705	106345	Enzo Doria	05/2013
8035	2^353267-19857	106344	Enzo Doria	06/2013
8036	(46*10^106343+143)/9	106344	Robert Price	01/2019
8038	(2^353189+3054)/2	106321	Stefano Morozzi	09/2020
8037	35087^1072+1072^35087	106321	Hans Havermann	10/2020
8039	(2^353184+1290)/2	106319	Stefano Morozzi	01/2021
8040	F(508799)/24738824977/1990778864897	106310	Serge Batalov	07/2024
8041	26985^8684+8684^26985	106287	Hans Havermann	10/2020
8042	(2^353051+606)/2	106279	Stefano Morozzi	09/2020
8044	222748^3+3^222748	106278	Anatoly F. Selevich	12/2010
8043	(46*10^106277+107)/9	106278	Robert Price	06/2022
8045	(9179*2^353019-1)/9	106273	Lelio R Paula	05/2015
8046	2^353025+72257	106272	Enzo Doria	04/2016
8049	2^352932-20345	106244	Enzo Doria	06/2013
8047	(2^353011-3)/745325861246794515484535	106244	Lelio R Paula	12/2013
8048	25628^13983+13983^25628	106244	Hans Havermann	10/2020
8050	2^352883-187	106229	Lelio R Paula	10/2011
8051	20^81649-19^81649	106228	Jean-Louis Charton	03/2011
8052	(55*10^106222+377)/9	106223	Robert Price	02/2019
8053	2^352814-131	106208	Lelio R Paula	10/2011
8054	2^352752+73951	106189	Enzo Doria	04/2016
8055	11876*25^75945+357	106171	Eric Chen	10/2023
8056	6^136434+5	106167	Lelio R Paula	11/2014
8057	25296^15737+15737^25296	106166	Hans Havermann	09/2020
8058	8*10^106157-13	106158	Robert Price	08/2019
8059	2^352641+225677	106156	Enzo Doria	08/2024
8060	7*5^151872-8	106155	Lelio R Paula	11/2014
8061	105^52520-2	106153	Lelio R Paula	10/2017
8062	(23*10^106152-29)/3	106153	Robert Price	03/2022
8063	2^352601-1604809	106144	Enzo Doria	05/2015
8064	12^98353-43	106141	Lelio R Paula	02/2017
8065	2^352585-18901	106139	Enzo Doria	05/2013
8066	26363^10614+10614^26363	106135	Hans Havermann	09/2020
8067	(2^352554-3)/193	106128	Lelio R Paula	12/2013
8068	2^352540+15015	106126	Lelio R Paula	01/2017
8069	25068^17119+17119^25068	106125	Hans Havermann	09/2020
8070	2^352524-3149	106121	Yves Minet	10/2014
8071	(7*10^106119-67)/3	106120	Robert Price	10/2021
8072	2^352486-1858781	106109	Enzo Doria	04/2016
8073	2^352444+12705	106097	Lelio R Paula	01/2017
8074	28561^5182+5182^28561	106090	Hans Havermann	10/2020
8075	(182*10^106083+43)/9	106085	Robert Price	02/2020
8076	(266*10^106066+1)/3	106068	Robert Price	04/2020
8077	(7*10^106066-187)/9	106066	Tyler Busby	01/2023
8078	2^352228-18953	106032	Enzo Doria	05/2013
8079	(2^352223+1118)/2	106030	Stefano Morozzi	09/2020
8080	(2^352212+2250)/2	106027	Stefano Morozzi	01/2021
8081	(2^352136+2638)/2	106004	Stefano Morozzi	09/2020
8082	2^352107+1872533	105995	Enzo Doria	05/2016
8083	(2^352096+2086)/2	105992	Stefano Morozzi	09/2020
8084	2^352066-2591	105983	Yves Minet	07/2014
8085	2^352030+715	105972	Lelio R Paula	10/2011
8086	9*6^136176-5	105967	Lelio R Paula	11/2014
8087	17099*2^351991+58329	105965	Paul Vanderveen	12/2017
8088	122^50789-50789^122	105965	Norman Luhn	09/2024
8089	28582^5097+5097^28582	105963	Hans Havermann	09/2020
8090	155^48377+2	105962	Lelio R Paula	08/2013
8091	(23*10^105944-119)/3	105945	Robert Price	07/2021
8092	2^351865+1869707	105922	Enzo Doria	05/2016
8093	24974^17427+17427^24974	105921	Hans Havermann	09/2020
8094	25163^16194+16194^25163	105920	Hans Havermann	09/2020
8095	2^351831+23	105912	Lelio R Paula	10/2011
8096	(2^351818+3798)/2	105908	Stefano Morozzi	02/2021
8097	9*2^351784-5	105899	Lelio R Paula	09/2014
8098	(2^351776+2766)/2	105895	Stefano Morozzi	01/2021
8099	(85*10^105881+203)/9	105882	Robert Price	09/2020
8100	2^351671-112387	105864	Enzo Doria	06/2014
8101	2^351669-109501	105863	Enzo Doria	04/2014
8102	2^351644+74731	105856	Enzo Doria	04/2016
8103	13^95025-42	105853	Lelio R Paula	12/2016
8104	2^351599+15015	105842	Lelio R Paula	01/2017
8105	19^82763+90	105834	Lelio R Paula	01/2017
8106	(205*10^105831-1)/3	105833	Robert Price	11/2021
8107	26050^11551+11551^26050	105832	Hans Havermann	09/2020
8108	(9179*2^351540-1)/221	105826	Lelio R Paula	05/2015
8109	20^81329-51	105812	Lelio R Paula	01/2017
8110	(5*10^105811+211)/9	105811	Robert Price	02/2018
8111	2^351483+28425	105807	Lelio R Paula	01/2017
8112	25231^15610+15610^25231	105804	Hans Havermann	09/2020
8113	15^89960+86	105802	Lelio R Paula	02/2017
8114	2^351460-17289	105801	Enzo Doria	05/2013
8115	19^82735+22	105798	Lelio R Paula	01/2017
8116	2^351435-109077	105793	Enzo Doria	04/2014
8117	2^351393+1089	105780	Lelio R Paula	01/2017
8118	2^351364+72631	105772	Enzo Doria	04/2016
8119	(2^351333+3626)/2	105762	Stefano Morozzi	09/2020
8120	26818^8783+8783^26818	105761	Hans Havermann	09/2020
8123	2^351305+1872467	105754	Enzo Doria	05/2016
8122	3^221649+16	105754	Lelio R Paula	11/2016
8121	32511^1790+1790^32511	105754	Hans Havermann	09/2020
8124	8*3^221637-5	105749	Lelio R Paula	09/2014
8125	2^351279-2780449	105746	Enzo Doria	03/2016
8126	(2^351263+3198)/2	105741	Stefano Morozzi	09/2020
8127	15^89903-26	105735	Lelio R Paula	02/2017
8129	2^351213-73	105726	Lelio R Paula	10/2011
8128	(2^351214+1210)/2	105726	Stefano Morozzi	09/2020
8130	2^351192-4589	105720	Yves Minet	07/2011
8131	20^81250-33	105709	Lelio R Paula	12/2016
8132	(2^351133+3530)/2	105702	Stefano Morozzi	09/2020
8133	(2^351103+534)/2	105693	Stefano Morozzi	09/2020
8134	2^351076-113159	105685	Enzo Doria	07/2014
8135	93^53688-2	105684	Lelio R Paula	09/2013
8136	2^351060-4559	105680	Yves Minet	07/2011
8137	((10^52836-1)10000/9+5927)10^52836+(10^52836-1)/9	105676	Hans Havermann	08/2019
8138	11^101473-750	105674	Enzo Doria	11/2012
8139	3*5^151181-8	105672	Lelio R Paula	11/2014
8140	15^89831-34	105650	Lelio R Paula	02/2017
8142	11^101448-360	105648	Enzo Doria	08/2012
8141	3*7^125011+4	105648	Lelio R Paula	11/2014
8143	2^350943-113269	105645	Enzo Doria	07/2014
8144	2*10^105636-91	105637	Robert Price	04/2020
8145	24231^22880+22880^24231	105634	Hans Havermann	09/2020
8146	35296^983+983^35296	105626	Hans Havermann	09/2020
8147	2^350868-19725	105622	Enzo Doria	06/2013
8148	2^350858-59291	105619	Enzo Doria	10/2015
8149	V(758484)/1516967/19720583	105618	Serge Batalov	07/2024
8150	2^350851+135	105617	Lelio R Paula	10/2011
8151	2^350841-741	105614	Lelio R Paula	01/2017
8152	3*10^105582+77	105583	Robert Price	09/2018
8153	24915^17284+17284^24915	105581	Hans Havermann	09/2020
8154	(5*10^105576-53)/3	105577	Robert Price	09/2020
8155	8*10^105571+3	105572	Robert Price	08/2015
8156	2^350674-78557	105564	Jorge Menendez	03/2018
8157	2*5^151026-3	105563	Lelio R Paula	11/2014
8158	(2^350702+5)/34264674063	105562	Lelio R Paula	12/2013
8159	6^135647-5^135647	105554	Jean-Louis Charton	02/2009
8160	3^221211+236	105545	Lelio R Paula	11/2016
8161	(32*10^105530-77)/9	105531	Robert Price	06/2018
8162	10^105515+33	105516	Lelio R Paula	11/2016
8163	24644^19125+19125^24644	105516	Hans Havermann	10/2020
8164	10^105515-41033	105515	Patrick De Geest	12/2016
8165	(29*2^350473-1)/267927	105499	Lelio R Paula	03/2014
8166	2^350455-430567	105498	Harrison Mesh	06/2022
8167	17^85732-72	105489	Lelio R Paula	01/2017
8168	(2^350399+3618)/2	105481	Stefano Morozzi	09/2020
8169	(2^350379+1010)/2	105475	Stefano Morozzi	09/2020
8170	2^350356+24241	105468	Enzo Doria	10/2023
8171	25233^15118+15118^25233	105462	Hans Havermann	09/2020
8172	26261^10366+10366^26261	105454	Hans Havermann	09/2020
8173	2^350307-110329	105453	Enzo Doria	05/2014
8174	2^350253-20365	105437	Enzo Doria	06/2013
8175	(3*29^72089-1075)/4	105423	Curtis Bright	05/2015
8176	(2^350187+2658)/2	105417	Stefano Morozzi	09/2020
8177	4*10^105415-69	105416	Robert Price	01/2022
8178	21^79725-22	105414	Anonymous	09/2024
8179	(22*10^105407+179)/3	105408	Robert Price	02/2022
8180	2^350139-109009	105403	Enzo Doria	04/2014
8181	(2^350129+3026)/2	105400	Stefano Morozzi	09/2020
8182	(2^350097+2070)/2	105390	Stefano Morozzi	09/2020
8183	3*5^150763+4	105380	Lelio R Paula	11/2014
8184	12^97643+91	105375	Lelio R Paula	02/2017
8185	6*5^150744-7	105367	Lelio R Paula	11/2014
8186	(2^350018+2074)/2	105366	Stefano Morozzi	09/2020
8187	4*10^105364-39	105365	Robert Price	09/2020
8188	Phi(156135,-5#)	105361	Henri Lifchitz	12/2025
8190	2^349996-112169	105360	Enzo Doria	06/2014
8189	(2^349997+3702)/2	105360	Stefano Morozzi	09/2020
8191	(418*10^105343+23)/9	105345	Robert Price	02/2020
8192	25490^13563+13563^25490	105334	Hans Havermann	10/2020
8193	(5^504004)%F(504004)	105330	Henri Lifchitz	06/2025
8194	11^101142-1080	105329	Enzo Doria	12/2012
8195	(68*10^105320-41)/9	105321	Robert Price	10/2013
8196	24800^17649+17649^24800	105319	Hans Havermann	09/2020
8197	3^220712-9934	105307	Enzo Doria	05/2014
8198	7*10^105296+9	105297	Robert Price	09/2015
8199	89*10^105284-7	105286	Robert Price	04/2020
8200	2^349739+1873373	105282	Enzo Doria	06/2016
8201	7^124574+24	105278	Lelio R Paula	11/2016
8202	2^349708-20957	105273	Enzo Doria	06/2013
8203	34115^1218+1218^34115	105267	Hans Havermann	09/2020
8204	24029^24029-24020^24020	105265	Henri Lifchitz	09/2024
8205	2^349649-20469	105255	Enzo Doria	06/2013
8206	2^349607-20109	105243	Enzo Doria	06/2013
8207	(85*10^105242+473)/9	105243	Robert Price	01/2020
8208	2^349594-19085	105239	Enzo Doria	05/2013
8209	2^349530+1874479	105220	Enzo Doria	06/2016
8210	(3^220528+8)/8081	105215	Lelio R Paula	12/2013
8211	(106*10^105199+17)/3	105201	Robert Price	04/2021
8212	(2^349452+3570)/2	105196	Stefano Morozzi	09/2020
8213	3^220464-112852	105189	Enzo Doria	07/2014
8214	2^349419-17349	105186	Enzo Doria	05/2013
8215	2^349400-2579	105180	Yves Minet	07/2014
8216	8*5^150471+3	105176	Lelio R Paula	11/2014
8217	(2^349359+2298)/2	105168	Stefano Morozzi	02/2021
8218	655^37342+37342^655	105165	Norbert Schneider	08/2018
8219	13^94403+94	105160	Lelio R Paula	12/2016
8220	349315*2^349315+3	105160	Anonymous	09/2025
8221	2^349301-112309	105151	Enzo Doria	06/2014
8222	30291^2960+2960^30291	105149	Hans Havermann	09/2020
8223	Phi(269776,7)	105144	Henri Lifchitz	02/2026
8224	27350^6981+6981^27350	105132	Hans Havermann	09/2020
8226	9*2^349220+5	105127	Lelio R Paula	09/2014
8225	(2^349225+3122)/2	105127	Stefano Morozzi	09/2020
8227	7*3^220317+8	105119	Lelio R Paula	09/2014
8228	7^124386+88	105119	Lelio R Paula	11/2016
8229	(2^349197+570)/2	105119	Stefano Morozzi	09/2020
8230	2^349171-19657	105111	Enzo Doria	06/2013
8231	(2^349115+590)/2	105094	Stefano Morozzi	09/2020
8232	(2^(6*58185+1)-5)/3	105093	Kevin Acres	11/2013
8233	(2^349111-5)/3	105093	Lelio R Paula	12/2013
8234	675^37142+37142^675	105087	Norbert Schneider	08/2018
8235	2^348981-2797573	105054	Enzo Doria	04/2016
8236	(445^39667+1)/446	105050	Jinyuan Wang	05/2024
8237	2^348869-6555	105021	Lelio R Paula	01/2017
8238	10^105003-17319	105003	Alfred Reich	08/2024
8239	5^150217+78	104998	Lelio R Paula	11/2016
8240	(88*10^104989-1)/3	104991	Robert Price	04/2020
8241	(28*10^104972+149)/3	104973	Robert Price	12/2019
8242	24927^16262+16262^24927	104972	Hans Havermann	10/2020
8243	2^348703-113005	104971	Enzo Doria	06/2014
8244	(191*10^104956-17)/3	104958	Robert Price	11/2021
8245	2^348612-809	104943	Yves Minet	05/2013
8246	(73*10^104942-1)/9	104943	Robert Price	01/2015
8247	(29^71761-5^71761)/24	104942	Robert Price	03/2026
8248	2^348583-350407	104934	Enzo Doria	06/2015
8249	2^348531-949	104919	Yves Minet	05/2012
8250	20^80636-59	104910	Lelio R Paula	12/2016

Find by discoverer :

PRP Records

Probable Primes Top 10000

(302978 PRPs in the top)